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The most famous of the Lake Monsters is found in Loch Ness. 'Nessie' has been sighted for centuries. Loch Ness isn't the only lake in Scotland that has a monster, many other lakes in Northern Scotland have ancient legends about monsters.
Monsters have been seen in many of the large, deep, cold water North American lakes. Lake Champlain - Lake Champlain is a large lake that defines much of the border between the State of Vermont and the State of New York, and "Ogopogo" of Okanagan Lake -
Lake monsters have also been reported in Africa. Some of the African Dinosaur reports from earlier this century are similar.
"Manipogo" of Lake Manitoba There have been occasional sightings of monsters at other lakes and rivers
can only move their bodies from side to side. The bodies of plesiosaurs were rigid, and could certainly not undulate either up and down or from side to side."2
So, if reptiles (including snakes) can only move from side to side, and cannot replicate the vertical rippling motion typical of "sea serpent" and lake monster sightings, and the plesiosaur's structure was too rigid to allow for this type of motion, this leaves the most likely candidates for these mysterious sea serpents to be the Mosasaur (shown at the top of this page), the zeugledon or basilosaurus (forms of prehistoric whale) or, as Coleman believes, a completely separate, unknown reptilian species.3